Standards and Guidelines for Crochet and Knitting
Craft Yarn Council
Use: Definitions and labeling conventions
Limitations: Industry guidance rather than a product-level tolerance specification.
Evidence registry
Sources behind the calculations
21 records support definitions, formulas, demand validation, and visible limitations. Competitor and community records are discovery signals only.
Standard Yarn Weight System
Craft Yarn Council
Use: Weight categories, gauge ranges, hook ranges
Limitations: CYC explicitly labels ranges as guidelines.
Yarn Standards FAQs
Craft Yarn Council
Use: Interchangeability limitation
Limitations: A shared category does not establish interchangeability.
Getting Started: Yarn Labels
Craft Yarn Council
Use: Label fields: length, mass, fiber, gauge, dye lot
Limitations: General consumer guidance.
Gauge and Why It Is Important
Craft Yarn Council
Use: Gauge and swatch purpose
Limitations: Educational guidance, not a universal finishing protocol.
Hooks and Needles
Craft Yarn Council
Use: Metric hook sizing and gauge reminder
Limitations: Hook size alone cannot establish matching gauge.
How to Measure Wraps Per Inch
Craft Yarn Council
Use: WPI method and subjectivity
Limitations: WPI varies with wrapping tension and still requires a swatch.
NIST Guide to SI: Conversion Factors
NIST
Use: Unit conversions
Limitations: Used only for deterministic unit conversion.
How Much Yarn Do I Need for My Crochet Project?
Dora Does
Use: Swatch area and mass extrapolation
Limitations: Practitioner method; examples are independently recalculated.
How to Make and Measure a Crochet Gauge Swatch
Dora Does
Use: Representative swatch measurement
Limitations: No quantified error bounds.
Crochet Design Basics: Gauge and Fit
Dora Does
Use: Gauge arithmetic
Limitations: Simple-dimensional method does not validate shaped construction.
How Much Yarn Do I Need for a Particular Pattern?
Lion Brand Yarn
Use: Product-specific yardage reminder
Limitations: Examples are manufacturer-specific.
How to Substitute Yarn for a Crochet Pattern
The Loophole Fox
Use: Substitution workflow and WPI/gauge considerations
Limitations: Designer workflow, not a formal standard.
Yarn Substitution Calculator for Patterns
Easy Crochet
Use: Competition and feature comparison
Limitations: Discovery only; formulas and claims are not copied.
Yarn Substitution Calculator and Compatibility Chart
StitchMath
Use: Competition and positioning
Limitations: Discovery only; compatibility claims are not adopted.
Using Yarn Sub
Crochetly
Use: Current market feature comparison
Limitations: Discovery only; product-ranking logic is not reused.
Yarn Substitution Calculator
Yarn Converter
Use: Current quantity-calculator coverage
Limitations: Discovery only.
Yarn Substitution Calculator
ArtPatt
Use: Current quantity and gauge messaging
Limitations: Discovery only.
How do I compare different yarns in the same weight category?
Reddit / r/CrochetHelp
Use: Recent user confusion about meters per gram and gauge
Limitations: Demand signal only; comments are not factual authority.
Discontinued yarn type: what should I substitute?
Reddit / r/CrochetHelp
Use: Recurring discontinued-yarn problem
Limitations: Demand signal only.
Do I have enough yarn for this sweater substitution?
Reddit / r/CrochetHelp
Use: Quantity plus gauge confusion
Limitations: Demand signal only.